Why do the screws and nuts securing the plow disc frequently loosen, and how can I prevent them from loosening?

“Furrowing plow” is an agricultural tool that helps prepare the planting area without wasting labor. It is easy, fast, neat, consistent, and efficient. It can be used with many types of plants.

Why should you use a plow to improve hard soil? What is hard soil? What are the benefits of a plow? Owners of sugarcane, rice, or fruit orchards should know this!